Rock drilling mechanism



July 11, 1933- w. A. SMITH, 5R., ET AL 1,917,335

ROCK DRILLING MECHANI SM Filed June 6. 1932 TIEZE. A TTORNEY Patented July 11, 1933 UNITED STATES PATE WILLIAM A. SMITH, SR., OF EASTON, PENNSYLVANIA, AND LLAB A; SMTT' ASSIGNORS PHLLIPSBRGg NEW' JERSEY,

JR., OF T() INGECRSQLL-RAND COMPANY, F

JERSEY CITY, NEW JERSEY, A CQEEORATION OF J ROCK BREITLING- IVIECHAll-TISM i Application filed June 6,

ing device for rock drills of the fluid actuated Y type. One object of the invention is to maintainwa uniform feeding pressure on the Working' implement actuated by the rock drill.

Another object is to facilitate the Wit-hdravval of the rock drill from the Work after the-drill hole has been completed.

Still another object is to enable the rock drill to be manually rotated through the feeding. device andby a handle arranged at the rear end thereof. j

Other objects will be in part-obvious and in part pointed out hereinafter.

In the accompanying drawing illustrating the invention and in which similar reference characters refer to similar parts,

Figure lis a longitudinal side view of a roch drill drilling mechanism constructed in accordance with the practice of the invention and having a supporting device which is shown partly broken away,V

Figure 2 is a transverseview through the feeding device taken throughFigure l on the line 2-2 lookin@ inthe directionindicated b by the arrows, and

Figure 3 is a transverse view taken through FigureQ on the line 3 3.

Referring more particularly to the drawing, the drilling mechanism which is designated, in general, by A., comprises a percussive element or motor B', as for A instance a coal pick7 adapted to actuate a Working implement C for drilling holes in the roch D.

In accordance with the practice ofthe invent-ion the motor B is providedvvitha feeding device adapted tobe actuated by pressure fluid for advancing the motor in the direction of the material D in accordance with the penetration of the Workingy implement C thcreinto and for effecting a reverse movement of the motor. The means provided vfor this purpose comprises a 4feedinV cylinder E wherein is a piston chamber F for the accommodation of a. reciprocatory piston G having a piston rod H which is lixedly connected to the motor B by means of a connection J. The connection J 50 may, as indicated, also serve as the back head 1932.` Serial No. 615,525.

for the motor B and may be threaded to the rod H and to the motor Band be clamped to these elements by means of pinch bolts K.

Y Suitable closures are provided for the ends of the cylinder E in the form of heads L and O which may be threadedly connected to the ends of the cylinder. The head'L which is arranged on the end of the cylinder E adjacent the motor B hasa bore P to guide'the f rod H, and. Within the head L is a cavity Q, for the reception of packing consisting of alternately7 arranged cup leathers R and metallic rings S to seal the front end of the piston E. .A supply conduit T is connected to the head L for constantly admitting pressure fluid into the front end of the cylinder' f E .to act against a front pressure area U of the pistonA G. 4

The head Q on the rear end of the cylinder E is bored to form a series of. stepped .poriJ tions Y, W and X of progressively increasing diameter 1n the order named from the'outer or rear end of the head O. Disposed Within y .the portion V of the bore is a spindle Y hav.-

ing a head Z which lies within the portion `W fr ofthe bore and bears against a shoulder at the liuncture of the portions V and W. The spindle Y-projects beyond theV free end vof a nut c threaded on the endof the si'aindle.l

.the head Oand into a bore c of a handlev l which 1s clamped to the spindle by means of` The spindle Y is freely rotatable Within A the head O and has connected thereto Va bar j preferably of rectangular shape which eX- tends through a'correspondingly shaped bore g in thepiston G, thereby interloclringly engaging the piston for imparting rotary move- `ment of the handle' cl to the moto-r B. Within the handle (Z is a chamber 7L to Which pres- 'Y sure fluid is 'supplied'by a conduitji connected to the handle. l

From the chamber 7L, and in the handle CZ, leads a supply passage 7c which opens into a passage 0 in the spindle for conveying pressure fluid into a passage ya which extends longitudinally through the bar ,'F and Communica-tes at its front end with the-interior'vof the rod H. The bar f is. moreover, provided with .a port g adjacent the head Z Vfor exposing a rear pressure area r on the piston G to pressure fluid for driving the piston forwardly through the cylinder' E.

At the juncture of the chamber h and the passage 7c is a valve seat s for the accommodation of a throttle valve t which is normally held closed by a spring u in the chamber h. The throttle valve t has a stem o which extends through the spindle and into a depression or notch w in the handle (l wherein is arranged a lever fo whereby the throttle valve t may be opened.

Any suitable means, as for instance that designated by y, may be provided for supporting the drilling mechanism. The means illustrated comprises a supporting frame a whereon is arranged a column 2 to support a saddle 3. Preferably the saddle 3 is provided with a bore 4 for the reception of a rotatable member 5 having a clamp element (i adapted to be secured to the cylinder E to support the weight of the drilling mechanism.

The operation of the device is as follows: Let it be assumed that the pressure area U on the piston G Vis exposed to pressure fluid and in which case, of course, in the absence of pressure lluid in the rear end of the cylinder E the piston G will be held in the rear eX-` tremity ofthe piston chamber F. If then the throttle valve t is opened pressure'fluid flows through the passages la, o and 79 into the Yrod H, thence into the back head J for distribution to the motor by suitable valve mechanism (not shown) for actuating the working implement C into the material D.

Upon the admission of pressure fluid into the passage p a portion of such pressure fluid flows through the port g into the rear end of the piston chamber F to act against the pressure area r of the piston Grr and drive the piston, and therefore the motor B, in the direction of the material D. vThis movement of the piston and the motor and the operation of the motor B will continue as long as the Vthrottle valve t remains open or until the piston Gr reaches the forward extremity of the piston chamber F.

Upon releasing the lever m the valve t will be closed by the spring u thus cutting off the further admission of pressure fluid into the channels communicating with the passage k. The pressure fluid remaining in these passages willthen pass through the motor B thereby evacuati'ng the interior of the rod H and the associated passages. vWhen this pressure fluid has been sufliciently reduced in value the pressure fluid acting against the front pressure area U of the piston G will immdiately retract the piston Gr and the motor In order to constantly shift the position of the cutting bit of the working implement during the drilling operation the handle d may beV rotated or oscillated and, inasmuch as the handle (l is interlockingly connected to the piston G by the bar f, the piston and the motor B will follow the movement of the handle (l. In this way the working implement C, which is of course also slidably interlocled with the motor B in a well known manner, will be rotated or oscillated to change its position with respect to the work.

7e claim: y

l. In a drilling mechanism, a fluid actu,- ated mot-or adapted to actuate a working implement, a feeding cylinder,` a fluid actuated piston therein and having opposed pressure areas, a rod on the piston supporting the motor and being hollow to convey pressure `fluid to the moto-r, a support for the feeding cylinder, a handle, a spindle for the handle rotatable in the cylinder and having a bore,

plement, a feeding cylinder, a'piston in the cylinder, a rod yon the piston affixed .to theifO5 iotor' and being hollow to convey pressure fluid to the motor, a 4handle rotatably connected to the feeding cylinder, a bar on the handle slidably interlocked with the piston and Vhaving a passage therethrough communicating with the rod and with one end of the cylinder, means for constantly supplying pressure fluid to one end of the piston, and means for selectively supplying pressure fluid to the other end of the piston and to the motor.

In testimony whereof w specification. i

- WILLIAM A; SMITH, SR. K

WILLIAM A. SMITH, JR.

have signed this llt] 

